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[Patellar changes during long-term observations on the Blauth knee joint endoprosthesis].
Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|March 1, 1984
Summary
Patellar maltracking and structural changes in Blauth knee prostheses are linked to pain. Patellar structural issues correlate with walking pain, while position changes do not significantly impact initial pain.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Patellar positioning and structural integrity are crucial for knee prosthesis function.
- Long-term outcomes of Blauth prostheses require evaluation regarding patellar complications.
Purpose of the Study:
- To assess the incidence of patellar maltracking and structural changes after Blauth prosthesis implantation.
- To investigate the correlation between patellar position/structure and patient pain patterns.
Main Methods:
- Long-term observation of 206 Blauth knee prostheses (average 37.6 months post-implantation).
- Axial roentgenograms to evaluate patellar position (subluxation, luxation).
- Assessment of posterior patellar surface for osteolytic destruction and correlation with pain.
Main Results:
- 12% of prostheses showed lateral patellar subluxation; one case of luxation.
- 12% exhibited osteolytic destruction of the posterior patella; a significant correlation existed between subluxation and destruction.
- Patellar structural changes were significantly associated with initial walking pain, unlike positional changes.
Conclusions:
- Patellar maltracking and structural degeneration are notable complications in Blauth prostheses.
- Retropatellar pain syndrome affects 10.2% of patients, potentially linked to prosthesis design (e.g., curvature radii, rotational center).
- Surgical intervention (patellectomy) was performed in some cases, with histological findings of arthrosis deformans and synovitis.